Dear Amy: I was adopted at 5 months old. I am very happy with my adopted parents and never knew my birth parents. I was completely loved by my adoptive family and always felt like a “real” family member. When my children were small, I tried to find out about my birth parents, only to be told the files were sealed. My problem is that occasionally someone who knows that I’m adopted will say I’m not really part of my adoptive family and can’t claim the family’s history as my own.